【摘要】 X射线探测器在医学影像、无损检测和国防军工等领域有广泛且重要的应用，直接式探测具有更高的理论空间分辨率，是X射线低剂量成像未来发展的方向。全无机CsPbI₃钙钛矿材料原子序数高、射线吸收截面大、离子迁移弱，是一种优异的直接探测材料。然而，CsPbI₃三维黑相α/β/γ结构在室温下热力学不稳定，易自发转变为非光活性的δ相，导致器件性能下降。本研究通过添加剂工程引入挥发性碘化二甲胺（DMAI）能有效改善晶格应变并抑制晶格崩塌，获得热力学稳定的室温γ-CsPbI₃黑相。基于溶剂抽滤法将含DMAI添加剂的钙钛矿前驱液逐步浸透于多孔尼龙膜中，成功制备出室温稳定的γ-CsPbI₃柔性钙钛矿X射线探测器，器件的μτ积达1.16×10^-4cm²/V，灵敏度为209μC/(G_yair·cm²)。在弯折200次后，器件仍保持初始81.6%的优异性能，展现了全无机钙钛矿在高灵敏、高稳定柔性X射线探测及成像应用中的潜在价值。更多还原

【Abstract】 X-ray detectors are widely used in medical imaging,non-destructive testing,and the defense industries. Direct detection offers higher theoretical spatial resolution and is a key direction for future low-dose X-ray imaging. All-inorganic CsPbI₃perovskites,with their high atomic number,large X-ray absorption cross-section,and weak ion migration,are excellent candidates for direct detection. However,the thermodynamic instability of the black-phase α/β/γ. at room temperature,which spontaneously converts to the nonphotoactive δ-phase, limits device performance. This study addressed this issue by introducing dimethylammonium iodide（DMAI） as a volatile additive that mitigated lattice strain and stabilized the γ-CsPbI₃black-phase at room temperature. Using a solvent filtration method,the perovskite precursor solution containing DMAI additive was gradually infiltrated into the porous nylon membrane,and the room-temperature-stable γ-CsPbI₃ flexible X-ray detector was successfully fabricated,with a μτ product of 1. 16 × 10^-4cm²/V and a sensitivity of 209 μC/(G_yair·cm²). After 200 bending cycles,the device retained81. 6% of its initial performance,demonstrating the potential of all-inorganic perovskites in high-sensitivity,high-stability flexible X-ray detection and imaging applications.更多还原